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RFC 6621, "Simplified Multicast Forwarding", May 2012

Source of RFC: manet (rtg)

Errata ID: 3640
Status: Verified
Type: Technical

Reported By: Joseph Macker
Date Reported: 2013-06-06
Verifier Name: Adrian Farrel
Date Verified: 2013-06-06

Section A.4 says:

  4.  If "RtrPri(n0)" is greater than that of all tuples in the union
      of "N1" and "N2", then "n0" selects itself as a relay, and no
      further steps are taken.

It should say:

  4.  If "RtrPri(n0)" is greater than that of all tuples in
      "N1", then "n0" selects itself as a relay, and no
      further steps are taken.

Notes:

The initial verbal description of the E-CDS algorithm in first paragraph A.1 pg 40 is correct..as follows

1. If an SMF router has a higher ordinal (Router Priority, Router
ID) than all of its symmetric neighbors, it elects itself to act
as a forwarder for all received multicast packets.

But LATER in A.4 pseudocode Step 4 contains a bug. N2 (2 hop neighbors are included in this step). This pseudocode bug can cause incorrect behavior to occur.

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